Archive for August 2010

Question : What is Windowboxing? And why can’t I use my widescreen TV to watch the full aspect?

August 8, 2010

Answer:
As a person who watches too many movies, and has a powerful addiction to netflix, I have noticed recently that when I got a Roku player to watch my instant movies on my TV, there has been some aspect ratio surprises.

Surprises, I was not expecting in this day and age of digital, HD, wifi, easy instant wide screen, 3D world we now live in.

I noticed that some movies, even though they report widescreen (16:9) aspect ratio, appear on my widescreen TV in fullscreen (4:3) format. My jaw drops!

What? How could this be? How could any movie be translated today with fullscreen aspect ratio?

But it’s true. Not all of the movies on instant demand were translated in 16:9. Some were translated as the original DVD packaging aspect ratio. So if the movie was old and not popular, it got minimally translated.

Then I noticed something else. I put a DVD into the DVD player and played the movie on my laptop. The movie showed up automatically in a very small aspect ratio. A very thin small aspect ratio.

I said, what’s going on here? Why are all these movies going into different aspect ratios when the world has now conformed to “Widescreen”?

Then I found out about an annoying thing called Windowboxing. This actually has nothing to do with the Windows Operating Systems, so don’t jump to that conclussion.

occurs when the aspect ratio of the media is such that the letterbox effect and pillarbox effect occur simultaneously

I thought maybe hollywood was working on some new resolution and needed to changed the aspect ratio. Or maybe there was a new aspect ratio going on that I was unaware of. I mean, what was going on here.

But alas, these things happen when we get complicated.

Here’s a better explaination of it:
http://en.wikipedia.org/wiki/Windowbox_(film)

Trouble with it is, there is no way fix this on a laptop. So for the moment it seems, this is how it is.

Just to say I’m not insane, and the world isn’t totally against me, this is an explaination of what’s going on when you can’t really see the movie, even though you have a widescreen HD TV or monitor. Thank you hollywood.

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How to manually check electrical wires for polarity.

August 1, 2010

Multimeters can be confusing and scary for first timers. That pretty much goes for anything you use for the first time, I suppose. But you may get scared away by all the symbols and meanings and different configurations that are on multimeters, if you’ve never used one before.

But how did you learn to drive? You had to learn all the traffic symbols and rules before you successfully hit the road. Same deal here. Crack the encryption and begin to learn the language and you’ll wonder how anyone could be scared of this wonderful little tool.

So I hope to begin writing some basics of using a Digital Multimeter blog on here as well. Probably giving it another category such as Tutorials/Walkthroughs or something of the like.

In this blog I’d like to just give one or two quick basics to handling and reading a Digital Multimeter. Something quick and direct for the first timers, as I myself once was.

The following will be a walkthrough on how to check the polarity of circuits (wiring) with a Digital Multimeter. I can only walk you through Digital Multimeters because I’ve never used an Analog Multimeter (I’m so nu skool!).

Okay, so the first step to doing anything with electrical devices or electrical circuits is to take those saftey precautions. Don’t electricute yourself or damage your home appliances because you got bored and wanted to see the voltage of your microwave. Please follow all saftey rules in your Digital Multimeter’s manual, or the ones you found online. I’m no where near responsible for anyone’s mistakes, proceed with caution and at your own risk!

The first thing to know about Multimeters is that they are just as fragile as the circuits you are testing them on. Don’t test a little cheapie multimeter on something that’s drawing in 100 amps of electricty and set it to 10 amps. It will fry your multimeter and then break and maybe even cause damage to you. Know your Multimeters limitations and play by them.

Okay,

Today we will be testing wiring for polarity. What does that mean?

It means that the wires were not marked or there is absolutely no indication which wire is Positive (+) and which wire is Negative (-). This will be essential to know the correct polarity if you are testing circuits and devices to ensure that the device is working correctly or not. Or if you must go in and rewire or something, you must know the correct polarity or the device will not work when you are finished repairing it. Today’s wiring is indication somehow someway by the negative wire having somekind of indication on it. But as I stated before, this is just a simple test for someone to get used to using a Multimeter.

Pretty simple.

So turn on your Digital Multimeter and connect the Negative (-) lead to the COM port. Then connect the Positive (+) lead to the V/mA port. Make sure to set your settings to the next highest rating of voltage. For this example, since I’m testing the wiring of a 1.5v DC wire, set the DCV to 20V.  I set it this way because it’s the lowest setting of that range on my Multimeter that I’m using.

Then simply touch your Positive and Negative leads to the wire. You will get a numerical reading regardless of the polarity. But the point of this exercise is to make sure we know the polarity of the wires. If you see a Negative (-) sign flashing before the numerical value, you are recieving a “negative” reading. This means your leads are in the incorrect polarity positions on the circuit (wires). Switch the leads to the opposite wires. You should get the same numerical reading, just without the flashing negative signal before them. You have corrected the polarity, and the multimeter’s leads are attatched to the correct polarity. This means that whatever wire the Postive (+) lead is connecting to at this point, is a Positive wire. The lead connecting to the other wire is telling you, the wire is negative.

The simplist version of this test is for speaker wire. If the polarity is reversed, the sound output to the speakers will be noticable. If the polarity is correct, the sound will be normal. Once again, if you reverse the polarity on your speakers, no harm will be done, it will just sound bad. Simply reverse the polarity to regain proper sound.